This is a sale of the insole only. For Longchamp Le Pliage L size. Made with 1.0mm thick PP sheet. (Matte or glossy finish, will vary depending on stock availability.) Previously, I was selling 0.75mm thick insoles, but I received positive feedback for offering a thicker 1.0mm version separately on the same page, so I've decided to make it a standard item. If you're concerned about the bag losing its shape when carrying heavy items, this 1.0mm thickness is recommended. (Please note that this is not a wooden or plastic board, so it will flex somewhat under weight. Please be aware of this before purchasing.) ☆Currently, 0.75mm, 1.0mm, and 1.5mm thicknesses are available. This is the intermediate thickness. The size is made to fit my own bag (Longchamp Le Pliage L size, model number 1899, bottom size approximately 30 x 19cm).